Carbon material for electrode and non-aqueous secondary battery using said electrode carbon material

Abstract

Disclosed is a carbon material for electrode. The carbonaceous material has a plane space d002 of a (002) plane less than 0.337 nm in an X-ray wide angle diffraction method, a crystallite size (Lc) of 90 nm or higher, an R value, as a peak intensity ratio of a peak intensity of 1360 cm<-1> to a peak intensity of 1580 cm<-1> in a Raman spectrum in use of an argon ion laser, of 0.20 or higher, and a tap density of 0.75 g / cm<3> or higher. Also disclosed is a multilayer structure carbonaceous material for electrode, which is manufactured by carbonizing some organic compounds where the carbonaceous material for electrode is mixed with the organic compounds. The battery using the carbonaceous material for electrode or the multilayer structure carbonaceous material for electrode has a large capacity, a small irreversible capacity admitted in the initial cycle, excellent capacity maintaining rate of the cycle, and particularly, largely improved quick charging and discharging characteristics.

Description

technical field

[0001] The present invention relates to a carbonaceous material for electrodes and a nonaqueous secondary battery using the carbonaceous material for electrodes. In particular, it relates to a carbonaceous material for an electrode capable of constituting a non-aqueous secondary battery with a large capacity and good rapid charge-discharge performance, especially a carbonaceous material for a negative electrode. technical background

[0002] In recent years, along with miniaturization of electronic devices, there has been an increasing demand for high-capacity secondary batteries. Compared with nickel-cadmium batteries and nickel-metal hydride batteries, lithium secondary batteries with high energy density are particularly attractive. Initially attempts were made to use lithium metal as the negative electrode material, but it was found that after repeated charging and discharging, lithium precipitated in a resinous (dendritic) form, penetrating the separator...